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Jus use the formula a+b/2

a=7;b=9

7+9/2=16/2=8

==7,8,9

take any2 no's

7+8/2=15/2

===7,15/2,8,9

take any 2 no's

8+9/2

17/2

===7,15/2,8,17/2,9

we got three numbers..now again select any other pair of no's

8,15/2

8+15/2/2

16+15/2*2=31/4

Therefor 4 rational numbers between 7 and 9 are

15/2,31/4,8,17/2

a=7;b=9

7+9/2=16/2=8

==7,8,9

take any2 no's

7+8/2=15/2

===7,15/2,8,9

take any 2 no's

8+9/2

17/2

===7,15/2,8,17/2,9

we got three numbers..now again select any other pair of no's

8,15/2

8+15/2/2

16+15/2*2=31/4

Therefor 4 rational numbers between 7 and 9 are

15/2,31/4,8,17/2